I think my Viking Platinum is very quiet - provided the bobbin is pretty full. You would think I'd learn by now that when the machine gets louder, the bobbin is getting lower and I wouldn't sew 10 HTS's with no bobbin thread! It's quieter than my FW but I think that's the foot - the FW does purr. The Viking will beep at me if I'm being stupid or changing settings but that's about it.